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@aart has a good article showing the progression of frostbite, so you can see how much comb and wattles they can lose and still recover: https://www.backyardchickens.com/articles/frostbite-in-sw-michigan.74597/

You shouldn't need to cull him just for that. He will likely lose most of the comb once the tissue dies and falls off but that's nature's way of dubbing large combed birds. He'll probably lose some of his wattles too since you can see damage there.